// 设置cookie
function setCookie(cname, cvalue) {
    document.cookie = cname + "=" + cvalue;
} 

// 获取cookie
function getCookie(cname) {
    var name = cname + "=";
    var decodedCookie = decodeURIComponent(document.cookie);
    var ca = decodedCookie.split(';');
    for(var i = 0; i <ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') {
            c = c.substring(1);
         }
         if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
         }
     }
    return "";
}
 
 // 删除cookie
 function removeCookie(cname){
	 document.cookie = cname +"=; expires=Thu, 01 Jan 1970 00:00:00 GMT";
 }